Insect bites initially cause pain and may then precipitate allergic reactions as venom deposited through the bite courses through the skin, explains Healthline. The intensity of the reaction varies from minor to life-threatening depending on the type of insect and the level of individual sensitivity to insect venom.
Mosquito bites cause itchy bumps that may be red or pink in color, states Dr. Andrea Bledsoe for Everyday Health. These bites can be a vector of harmful microorganisms that include the West Nile virus; symptoms of the disease typically appear five to 15 days after a bite.
Unlike mosquito bites, bed bug bites cause no pain, according to Dr. Bledsoe. However, the vast majority of individuals develop allergic reactions one to three days after a bite; these reactions are triggered by saliva from the insect. The allergic reactions precipitate inflamed, itchy bumps.
The vast proportion of spider bites result in symptoms similar to those caused by bee stings, notes Dr. Bledsoe. These include pain, swelling and red skin at the site of the bite. After eight hours, some individuals may experience more serious symptoms that include respiratory distress, nausea and pain in the stomach, back and muscles.
Flea bites cause an extremely itchy skin rash that may sometimes bleed, says Dr. Bledsoe. The rash is accompanied by swelling around the site of the bite. These symptoms typically appear a few hours after a bite.